CERN Accelerating science

Article
Title	Increasing High Luminosity LHC Dynamic Aperture Using Optics Optimizations
Author(s)	De Maria, Riccardo (CERN) ; Angelis, Yannis (CERN ; Aristotle U., Thessaloniki) ; Droin, Colas (CERN) ; Kostoglou, Sofia (CERN) ; Plassard, Fabien (CERN) ; Sterbini, Guido (CERN) ; Tomás García, Rogelio (CERN)
Publication	2024
Number of pages	4
In:	JACoW HB 2023 (2024) 507-510
In:	68th ICFA Advanced Beam Dynamics workshop on high-Intensity and High-Brightness Hadron Beams (HB 2023), CERN, Geneva, Switzerland, 9 - 13 Oct 2023, pp.507-510
DOI	10.18429/JACoW-HB2023-THBP21
Subject category	Accelerators and Storage Rings
Abstract	CERN’s Large Hadron Collider (LHC) is expected to operate with unprecedented beam current and brightness from the beginning of Run 4 in 2029. In the context of the High Luminosity LHC project, the baseline operational scenarios are currently being developed. They require a large octupole current and a large chromaticity throughout the entire cycle, which drives a strong reduction of dynamic aperture, in particular at injection and during the luminosity production phase. Despite being highly constrained, the LHC optics and sextupole and octupole corrector circuits still offer a few degrees of freedom that can be used to reduce resonances and the extent of the tune footprint at constant Landau damping, thereby leading to an improvement of the dynamic aperture. This contribution presents the status of the analysis that will be used to prepare the optics baseline for LHC Run 4.
Copyright/License	© 2024 the author(s) (License: CC-BY-3.0)

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